Well i had exactly the same problem, my sub turned off right away when i turned the whole thing on. Well i opened the subwoofer and was trying to find out something unusual, i took out, i believe, internal amp, well, whatever that thing is, under the lid. Which one is screwed with 6 copper screws, so you unscrew those screws, lift that lid and that whole board comes out. On that board i find something like burn around one of the parts.
http://www.flickr.com/photos/28004328@N04/3333561417/in/photostream/
you can see it in the pick, the part q2902, then i contacted JVC. At the beginning they said i need to take the whole thing to service center and so on. But later i made them to tell me what kind of part that is, so here :
http://www.jvcservice.com/store/ProductDetail.asp?Part=KTC3199/GL/-Tbought soldering gun in home depot for $15, returned after i was done. And that is it, just have to replace it, but total cost only $12 ($5 part +$7 shipping)
changed s video cord
i have the same promblem i have even switched jacks around the house and still nothing so i opened it up and i think i could be the fuses inside because when i turn on the dvd i hear a clicking sound inside the subwoofer but it does not turn on so it gets power but it loses it somewhere because it does not turn at all could it be the fuses ?
same here the cord the plugs the subwoofer to the dvd player has a bad connection on the woofer end.
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